Add dfinner grammar

psConfig/exercise/dfinnerEx4.conf

+[main]
+startdb=43;
+uttdb=47;
+silence=400;
+timeout=8;
+openDeviceDirectly=yes;
+alsadevice=sysdefault;
+
+[pocketsphinxinstance]
+name=confirm;
+jsgf=../../psGrammar/confirm/confirm.jsgf;
+rsbscope=/speechrec/psa/confirm;
+bestpath=no;
+autoload=yes;
+
+[pocketsphinxinstance]
+name=dfinnerEx4;
+jsgf=../../psGrammar/exercise/dfinnerEx4.jsgf;
+rsbscope=/speechrec/psa/speechRecognition;
+bestpath=no;
+autoload=yes;

psGrammar/exercise/dfinnerEx4.jsgf

+#JSGF V1.0;
+grammar dfinnerEx4;
+
+public <dfinnerEx4> = [tobi|tiago] ( <go> | <joke> | <calc> );
+
+<calc> = <number> <op> <number>;
+<number> = (one|two|three|four|five|six|seven|eight|nine);
+<op> = (plus|minus);
+<go> = (go to the door);
+<joke> = (tell me a joke);
+